MANUFACTURE OF PARTICLE DISPERSION COMPOSITE

PURPOSE:To manufacture the composite having excellent strength and wear resistance by burning a preform constituted of ceramic or metallic grains, granular organic substance and a binder and impregnating metallic molten metal thereto. CONSTITUTION:Organic powder in which carbon, etc., are not left by the decomposition by heating is added and uniformly dispersed into objective ceramic or metallic grains, to which an inorganic binder is added to form into a preform having a desired shape. The preform is burnt to thermally decompose and evaporate the organic powder, by which voids are formed. Metallic molten metal is impregnated into the preform to obtain the oxide dispersion composite having desired grain contents. By stepwise reducing the grain contents or by using the grains changed from the coarse to the fine from the outer side of the preform to the center, the composite in which mechanical characteristics are different between the outer side and the center part can be obtd.